Evening. So we have a little boy almost 8 months old. When he turned 6 months we worked really hard on establishing bed time routine. Was a struggle at times but in the last 3 weeks it's been great. We look for tiredness cues and then it's bath, story, twinkle twinkle and I walk out the room. Most of the nights in the last 3 weeks he is asleep within a couple of minutes. Worse case scenario he whinges for 5 -10 mins and then nods off. Since Sunday this has all gone out the window. We do everything as normal but when I lie him down to say goodnight he screams hysterically. Each night has taken about an hour to settle him and I've ended up having to rock him to sleep. Any ideas as to why this sudden change has happened. If he wakes in night he's quite good at self soothing and goes back to sleep unless hungry.